What semi-permanent hair dye works best for you?

I’m saying semi-permanent and I mean unnatural colors like blue, green, pink, yellow, dyes that glow under blacklight and so on.
I use Manic Panic and I’m quite happy with it, it’s been a month since I got my hair not all of it bleached and dyed blue, and the color is still good. Not the exact day one result, but it’s still there.
If you have used Manic Panic, did it work for you?
If you use other brands, what are they and which one do you consider the best?
Last part of the question, I promise: Is there such thing as permanent dye for unnatural colors?